**Brownie Layer:,Microwave butter and bittersweet chocolate in a 2-qt glass bowl on high for 1 1/2 minutes or until chocolate is melted, stirring mixture. Whisk 2 cups sugar, eggs, and vanilla extract.,Toss together 1 tablespoon flour, walnuts (if desired), and chocolate chips.,Stir remaining flour and salt into sugar mixture. Add walnut and chocolate chip mixture. Spread batter into a lightly greased 13x9x2-inch pan.,Bake at 350°F for 30 to 40 minutes. Set aside to cool.,**Oreo cookie layer:,Put all Oreo cookies (except 10 cookies) in blender for crumbs or crush in a ziploc bag if you prefer crumbles.,______,**Pudding Layer:,Pour milk into large bowl. Add dry pudding mixes. Beat with wire whisk for 2 minutes. Let stand 2 minutes. Spread over brownies.,**Topping:,Add Cool Whip on top of pudding layer and top with the 10 extra cookies (whole or crumbled) and drizzle Hershey syrup for decoration (if desired).